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Analysis of a semi-rigid connection for precast concrete

DEBS, M. K. El; MIOTTO, A. M.; DEBS, A. L. H. C. El
Fonte: THOMAS TELFORD PUBLISHING Publicador: THOMAS TELFORD PUBLISHING
Tipo: Artigo de Revista Científica
ENG
Relevância na Pesquisa
45.97%
This paper presents a study of a specific type of beam-to-column connection for precast concrete structures. Furthermore, an analytical model to determine the strength and the stiffness of the connection, based on test results of two prototypes, is proposed. To evaluate the influence of the strength and stiffness of the connection on the behaviour of the structure, the results of numerical simulations of a typical multi-storey building with semi-rigid connections are also presented and compared with the results using pinned and rigid connections. The main conclusions are: (a) the proposed design model can reasonably evaluate the studied connection strength; (b) the evaluation of strength is more accurate than that of stiffness; (c) for a typical structure, it is possible to increase the number of storeys of the structure from two to four with lower horizontal displacement at the top, and only a small increase of the column base bending moment by replacing the pinned connections with semi-rigid ones; and (d) although there is significant uncertainty in the connection stiffness, the results show that the displacements at the top of the structure, and the column base moments present low susceptibility deviations to this parameter.; FAPESP; CNPq

Contribuição ao estudo da estabilidade de edifícios de andares múltiplos em aço; Contribution to the study of stability of steel multi-storey buildings

Camargo, Rafael Eclache Moreira de
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 20/08/2012 PT
Relevância na Pesquisa
46.18%
Este trabalho apresenta uma análise comparativa de diferentes sistemas estruturais para um edifício de 20 pavimentos. Cada um dos modelos foi dimensionado através dos princípios do método da análise direta, presente na ABNT NBR 8800:2008. O método da amplificação dos esforços solicitantes (MAES) foi usado para se obter de forma simplificada os esforços atuantes nos elementos do edifício considerando os efeitos locais e globais de segunda ordem. A incidência do vento foi simulada de duas formas diferentes. Na primeira, chamada de uniforme, o vento foi aplicado sem excentricidade, gerando apenas o efeito de tombamento nas estruturas. Na segunda hipótese, considerou-se uma excentricidade devida aos efeitos de vizinhança, prescrita pela ABNT NBR 6123:1988, responsável por ocasionar o tombamento e a torção dos edifícios. Todas as análises numéricas foram repetidas fazendo o uso de outro método simplificado de segunda ordem, conhecido como P-Delta. Por meio dos resultados obtidos, constatou-se que a possibilidade de se reduzir a sobrecarga para o dimensionamento de pilares proporciona uma economia de material, mas, por outro lado, tem como consequência o aumento do tempo de análise, pois exige a utilização de diferentes combinações de cálculo para o dimensionamento de vigas e pilares. A estratégia utilizada para simular os efeitos de vizinhança mostrou-se satisfatória...

Método para estimar custos diretos da execução de edifícios: aplicação à alvenaria estrutural.; Method to forecast direct costs for multi-storey building construction: tested for structural mansonry.

Kato, Camila Seiço
Fonte: Biblioteca Digitais de Teses e Dissertações da USP Publicador: Biblioteca Digitais de Teses e Dissertações da USP
Tipo: Dissertação de Mestrado Formato: application/pdf
Publicado em 09/11/2012 PT
Relevância na Pesquisa
76.29%
O trabalho de mestrado propõe um método para estimar custos diretos de edificações, através da análise de fatores que comparam o edifício a ter o custo prognosticado com outro tomado como referência. Esta ferramenta é muito útil na medida em que a análise de custos durante estágios iniciais do empreendimento auxilia as empresas de Construção Civil a tomar decisões importantes, tais como a compra do terreno, o lançamento do empreendimento, a escolha da concepção arquitetônica da edificação, entre outras. O método utilizado para a elaboração desta ferramenta foi a modelagem, pois utilizou-se de análises paramétricas para descrever o funcionamento do prognóstico de custos. A simulação da ferramenta desenvolvida foi feita para o serviço de alvenaria estrutural, e envolveu levantamento bibliográfico para conhecer e quantificar os aspectos técnicos e arquitetônicos que influenciam o custo deste serviço. O método proposto, apesar de ter um desenvolvimento complexo, possui vantagens em relação a outros estudados na revisão bibliográfica, tais como: precisão, rapidez na utilização em alvenaria estrutural, entendimento de fatores influenciadores, possibilidade de atualização do método, utilização por diferentes empresas...

Case study : comparison between the acoustic performance of a mixed building technology building and a conventional building

Bragança, L.; Patrício, Jorge
Fonte: Multi-Science Publishing Co Lda Publicador: Multi-Science Publishing Co Lda
Tipo: Artigo de Revista Científica
Publicado em //2004 ENG
Relevância na Pesquisa
56.27%
The objective of this work is to compare the acoustical performance of MBT (Mixed Building Technology) constructions and conventional buildings. The sound insulation performance of a MBT construction was assessed by tests done in situ. The results were compared with similar data from earlier measurements undertaken by the Building Physics Laboratory of the University of Minho in Portugal, and from simplified prediction methods. The building where this comparison was done is a 3-storey building. The first 2 storeys were refurbished using conventional construction methods, but the 3rd storey was built using MBT methods, characterised by using lightweight materials, with high thermal insulation, and large fenestration areas. Based on the work undertaken, some conclusions and proposals for further work are presented.

Technical improvement of housing envelopes in Portugal

Bragança, L.; Almeida, Manuela Guedes de; Mateus, Ricardo
Fonte: IOS Press Publicador: IOS Press
Tipo: Parte de Livro
Publicado em //2007 ENG
Relevância na Pesquisa
35.88%
The main problems in multi-storey building envelopes in Portugal are the low thermal insulation and low airborne sound insulation. These problems are more relevant in buildings built before the publication of the first thermal code. The envelopes, mainly the façades of buildings built in that period, do not fulfill the actual users comfort requirements and construction codes. This way, it is necessary to find the most appropriate technical solutions to refurbish those façades. One of most used technical solutions is the ventilated façade. In this paper the impacts of this technical solution in standard envelopes are going to be discussed. The impacts will be assessed looking at technical, functional, social, economical and environmental proprieties.

The influence of ventilation in the work of domestic combustion appliances

Viegas, João; Pinto, Armando; Pinto, Manuel
Fonte: Instituto Politécnico de Viseu Publicador: Instituto Politécnico de Viseu
Tipo: Artigo de Revista Científica
Publicado em 13/06/2007 POR
Relevância na Pesquisa
36.02%
In dwellings with collective ventilation systems users often install mechanical exhaust hoods in order to improve the exhaust flow rate. In this research the impact of such devices on the work of the gas water-heater appliance (usually installed in the kitchen) is assessed. Field testing was carried out in order to evaluate the performance of natural ventilation systems in a multi-storey building and its adequacy to provide conditions for the work of the gas waterheater. The combination of mechanical ventilation in hoods and natural exhaust of combustion products of gas water-heater was also tested and critical conditions that lead to the safety stop of the gas water-heater were evaluated. A computer simulation program was used to predict the occurrence of safety problems in the work of the gas water-heater with different mechanical exhaust rates and two different air permeability of the building envelope. It is shown that it is possible to reduce negative impact of mechanical devices increasing the envelope air permeability, but this action will largely increase building heat loss.

Non-linear FEM analysis of seismic induced pounding between neighbouring multi-storey structures

Jameel,Mohammed; Islam,A.B.M. Saiful; Hussain,Raja Rizwan; Hasan,Syed Danish; Khaleel,M.
Fonte: Associação Brasileira de Ciências Mecânicas Publicador: Associação Brasileira de Ciências Mecânicas
Tipo: Artigo de Revista Científica Formato: text/html
Publicado em 01/09/2013 EN
Relevância na Pesquisa
36.32%
Pounding of neighbouring construction of structures due to seismic excitation increases the damage of structural components or even causes collapse of structures. Among the possible building damages, earthquake induced pounding has been commonly observed in several earthquakes. Therefore it is imperative to consider pounding effect for structures. This study aims to understand the response behaviour of adjacent buildings with dissimilar heights under earthquake induced pounding. Effects of different separation distances between structures are also investigated. Nonlinear finite element analysis in time domain has been carried out for pounding of neighbouring structures having varying heights. To show the importance of avoiding pounding in structures the results obtained were compared with model having no pounding phenomena. The results were obtained in the form of storey shear, pounding force, storey drift, point displacement and acceleration. The acceleration at pounding level significantly increases during collision of building. The generated extra pounding force may cause severe damage to structural members of structures. Pounding produces shear at various story levels, which are greater than those obtained from no pounding case. Building with more height suffers greater damage than shorter building when pounding occurs. Increasing gap distance tends to reduce story shear in consistent manner. The results also show that the conventional modelling of building considering only beams and columns underestimates pounding effects. More realistic modelling such as beams...

Prediction of deformations in post-tensioned prestressed suspended slabs in tall buildings.

Vincent, Thomas J.
Fonte: Universidade de Adelaide Publicador: Universidade de Adelaide
Tipo: Tese de Doutorado
Publicado em //2009
Relevância na Pesquisa
36.18%
The research presented in this thesis focuses on the accuracy of predicting deflections and cambers in partially prestressed suspended slabs. Precision in predicting this behaviour accurately is complex due to the large number of variables which affect the behaviour of suspended prestressed slabs. This level of complexity is particularly relevant for post tensioned slabs due to the numerous on site construction steps. Many of the variables are hard to determine accurately due to their tendency to be unique for each construction site. Variables such as ambient temperatures, concrete material properties, stressing times, applied loads, loading times, prop movement and humidity are all examples of these properties. Hence, when predicting the behaviour of post tensioned suspended slabs of a multi storey building there always remains a degree of uncertainty. The research presented in this thesis addresses crucial areas of this topic and ultimately aims to supply reinforced concrete designers and constructors with additional confidence when predicting this behaviour. The requirement for this project surfaced during the design stages of 151 Pirie, a multistorey building constructed in Adelaide, Australia. The design project for 151 Pirie was particularly complex due to a very ambitious construction timeline. The strict construction timeline was imposed due to the contractual agreement of early occupancy of the top three floors (of a 9 storey building). The client purchasing the top floors required functioning office space within a matter of months. This contract created a construction priority of erecting the bare structural requirements up to and including the top three floors in the shortest possible time. Fittings and services to the top three floors was then the secondary priority. Fitting and services to the lower floors (which would usually be achieved before the upper floors) would be performed at a later date. Excessive deflection limits of the slabs due to the accelerated construction were a major concern for the client. The effect on the deformation performance due to the accelerated construction was difficult to predict for the designer. Therefore...

A case study of partially pre-stressed multi-storey building incorporating fast-track construction

Vincent, T.; Ozbakkaloglu, T.; Seracino, R.
Fonte: Engineers Media Pty Ltd Publicador: Engineers Media Pty Ltd
Tipo: Artigo de Revista Científica
Publicado em //2010 EN
Relevância na Pesquisa
56.12%
T. Vincent and T. Ozbakkaloglu, R. Seracino

Eearthquake Engineering Experimental Research at JRC-ELSA

MOLINA RUIZ FRANCISCO JAVIER; GERADIN MICHEL
Fonte: Springer Publicador: Springer
Tipo: Contributions to Conferences Formato: Printed
ENG
Relevância na Pesquisa
35.97%
The ELSA laboratory is equipped with a large reaction-wall facility and has acquired its best expertise on the development and implementation of innovative experimental techniques mainly related to testing large-scale specimens by means of the pseudodynamic method. Apart from the relevant achievements within the testing techniques, such as the continuous pseudodynamic test and the development of effective techniques for the assessment of the experimental errors, the role of a reference laboratory in Europe has allowed ELSA to rely on the collaboration of many important research institutions that have contributed through the projects with and added maximum scientific value to the results of the tests. An example of pioneering tests performed for a relevant collaborative project are represented by the bi-directional tests performed on a multi-storey building, where the combination of sophisticated techniques have allowed for the first time to obtain most valuable information on the seismic experimental response of a torsionally unbalanced existing building in its original and retrofitted configurations.; JRC.G.5-European laboratory for structural assessment

3D-Building Height Extraction from Stereo IKONOS Data - Quantitative and Qualitative Validation of Digital Surface Models - Derivation of Building Height and Building Outlines

ECKERT SANDRA
Fonte: OPOCE Publicador: OPOCE
Tipo: EUR - Scientific and Technical Research Reports Formato: Printed
ENG
Relevância na Pesquisa
36.13%
This report is dealing with the digital surface model generation from VHR stereo satellite data with the focus on building height and shape extraction. The report provides a theoretical insight into orthorectification methods based on either empirical or rigorous, physical models and the theoretical aspects of digital surface model extraction. The requirement and ideal distribution of ground control points is discussed. In the final part of the report the results of four software packages, ENVI, PCI Geomatica, RSG and Leica Photogrammetric Suite, tested for urban DSM generation, are presented and described. The orthorectification accuracy analyses were done using QuickBird and IKONOS data. The geometrical accuracies of the tested GCP based orthorectification methods have shown that a rigorous physical model gives the best horizontal accuracies and has proven to be stable, whereas RF based models tend to be instable. For the digital surface model accuracy analyses stereo IKONOS data were mainly used. Two datasets were used to perform the tests. One study area is situated in Nairobi where a variety of building types are present, from high-rise buildings to small illegal shacks. The second study area is in Graz, which was mainly chosen because a very detailed reference surface model was available. The five evaluation tests for the Nairobi test area have shown that all tested software packages created DSMs that performed well in at least one of the tests. They all have advantages and disadvantages. Height accuracy as well as clear building shape extraction is of great importance for the use of DSMs in information extraction for settlement analysis and mapping. The highlighted tests are representing these criteria best. Judging them it can be concluded that overall the PCI and RSG software performed best. They should be favoured for DSM extraction. The quantitative accuracy assessment for the test area of Graz has shown that the best vertical estimation results were achieved with the software packages of LPS and PCI followed by RSG. The vertical MAE for built-up and impervious areas was 2.20m for PCI...

Cyber-physical testing of civil engineering structures at the ELSA laboratory

MOLINA RUIZ Francisco Javier; MAGONETTE GEORGES; PEGON Pierre; NEGRO Paolo; TAUCER Fabio; POLJANSEK Martin; PINTO VIEIRA Artur
Fonte: UPM Press Imprint Publicador: UPM Press Imprint
Tipo: Contributions to Conferences Formato: Printed
ENG
Relevância na Pesquisa
36.27%
The European Laboratory for Structural Assessment performs tests of full-size specimens of civil engineering structures and contributes to the scientific knowledge on the behaviour of different structural typologies. Many of the testing campaigns are oriented to the improvement of design standards such as the Eurocode8, which is the European standard for seismic design of structures. The classic step-by-step Pseudo-dynamic (PsD) testing method is well suited for such huge specimens and is relatively easy to implement, including the case of substructuring, but imposes a very low execution speed of the test. A substantial improvement is introduced by the continuous PsD method that allows for a faster execution of the test and improves the quality of the results by making a more effective use of the measurements. This paper briefly reports on some examples of application of the classic method, such as bi-directional PsD tests on a real-size multi-storey building by using up to nine DoFs and twelve actuators, where sophisticated geometric and static on-line transformations of variables between the equation of motion and the controllers were required. As a second example, substructuring techniques developed within the PsD method have proved to be very useful for obtaining the seismic response of large structures...

Pseudodynamic tests on a full-scale 3-storey precast concrete building:Behavior of the mechanical connections and floor diaphragms

BOURNAS DIONYSIOS; NEGRO Paolo; MOLINA RUIZ Francisco Javier
Fonte: ELSEVIER SCI LTD Publicador: ELSEVIER SCI LTD
Tipo: Articles in Journals Formato: Printed
ENG
Relevância na Pesquisa
36.27%
A full-scale three-storey precast building was tested under seismic conditions at the European Laboratory for Structural Assessment in the framework of the SAFECAST project. The unique research opportunity of testing a complete structural system was exploited to the maximum extent by subjecting the structure to a series of pseudodynamic (PsD) tests and by using four different structural layouts of the same mock-up, while 160 sensors were used to monitor the global and local response of each layout. Dry mechanical connections were adopted to realize the joints between: floor-to-floor, floor-to-beam, wall-to-structure; column (and wall)-to-foundation and beam-to-column. Particular emphasis was given in the seismic behaviour of mechanical beam-column connections, as well as in the response of floor diaphragms. Thus, the in-plane rigidity of three pretopped diaphragms with or without openings was assessed. In addition, two types of beam-to-column connections were investigated experimentally, namely hinged beam-column connections by means of dowel bar and emulative beam-column joints by means of dry innovative mechanical connections. Therefore, the seismic behaviour of floor diaphragms and pinned beam-column connections in a multi-storey precast building was addressed experimentally. The results demonstrated that the proposed new beam-to-column connection system is a viable solution toward enhancing the response of precast RC frames subjected to seismic loads...

La aportación estructural del Crystal Palace de la Exposición Universal de Londres 1851. Una ampliación del enfoque histórico tradicional.

López César, Isaac
Fonte: Redfundamentos Publicador: Redfundamentos
Tipo: Artigo de Revista Científica
SPA
Relevância na Pesquisa
36.34%
[Resumen] El objetivo del presente artículo es el de establecer la línea histórica que conduce desde la aplicación arquitectónica de los primeros elementos estructurales de hierro industrializado en edificios de varias plantas y cubiertas hasta la aplicación primigenia del pórtico rígido autoportante en un edificio de varias plantas. En este recorrido, el Crystal Palace de la Exposición Universal de Londres 1851 se revela como un elemento clave que articula la transición desde la tipología de entramado metálico estabilizado por muros perimetrales de fábrica hasta la moderna formalización del pórtico rígido autoestable aplicado al edificio en altura. Asimismo, se detectan las conexiones históricas existentes en dicho proceso, poniendo en valor edificios que han permanecido al margen de la historiografía arquitectónica convencional. Ampliamos, por tanto, el foco histórico centrado tradicionalmente en los logros de la Escuela de Chicago destacando y conectando históricamente los acontecimientos anteriores.; [Abstract] The aim of this paper is to establish a historical line from the first architectural application of structural elements made of industrial iron for roofs and multi-storey buildings to the first application of portal frame in a multi-storey building. With this in mind...

Seismic assessment of out-of-plane loaded unreinforced masonry walls in multi-storey buildings

Derakhshan, H.; Dizhur, D.Y.; Griffith, M.C.; Ingham, J.M.
Fonte: New Zealand Society for Earthquake Engineering Publicador: New Zealand Society for Earthquake Engineering
Tipo: Artigo de Revista Científica
Publicado em //2014 EN
Relevância na Pesquisa
46.12%
A procedure is proposed to evaluate the dynamic out-of-plane stability of cracked unreinforced masonry (URM) walls located in multi-storey URM buildings. The equations of dynamic motion are derived from first principles and representative single-degree-of-freedom (SDOF) models are proposed. The models have nonlinear stiffness properties that correspond to the restoring gravitational forces. A method is suggested to transform the nonlinear problem to a corresponding linear equivalent so that conventional spectral methods can be used to calculate wall response. The dynamic interaction between the URM building as the main structural system and the out-of-plane loaded walls as secondary elements is addressed by developing floor response spectra. Several buildings were assumed in a parametric study and subjected to code-compatible ground motion records. The absolute acceleration response at floor levels was calculated and the response spectra for that modified acceleration were subsequently obtained. The results from the study suggest that modifications should be made to the equations proposed for the Parts response spectra in the New Zealand seismic loading standard, NZS 1170.5:2004, in order to calculate the spectral response of out-of-plane loaded URM walls. Several worked examples are presented to demonstrate application of the procedure.; Hossein Derakhshan...

Ventilação natural em edifícios multifamiliares do "Programa Minha Casa Minha Vida"; Evaluating natural ventilation in multi-storey social interest housing

Juliana Magna da Silva Costa Morais
Fonte: Biblioteca Digital da Unicamp Publicador: Biblioteca Digital da Unicamp
Tipo: Tese de Doutorado Formato: application/pdf
Publicado em 06/12/2013 PT
Relevância na Pesquisa
36.05%
A ventilação natural é uma estratégia projetual que deve ser usada sempre que possível em países de clima quente como o Brasil, pois dentre suas vantagens está o conforto térmico e a economia de energia. O uso desta estratégia deve ser priorizado principalmente em projetos destinados à população de baixa renda como é o caso dos edifícios incluídos no "Programa Minha Casa Minha Vida"- PMCMV. O objetivo desta tese é discutir e ventilação natural no interior de edifícios multifamiliares do PMCMV em três tipologias arquitetônicas diferentes localizadas na cidade de Campinas/SP, no intuito de alertar os projetistas em geral de como pequenas decisões de projeto podem influenciar no conforto térmico dos usuários. Adotou-se o uso de simulação computacional da ventilação natural por meio de CFD (Computer Fluid Dynamics) como ferramenta capaz de realizar esta análise. Assim, primeiro realizou-se a seleção dos edifícios que serviram de estudo de caso e a consequente modelagem 3D destes, considerando suas aberturas. Posteriormente realizou-se caracterização climática dos ventos da cidade de Campinas/SP, para obtenção dos dados de entrada no CFD. Por fim, realizou-se a simulação computacional da ventilação natural nas três tipologias escolhidas como estudos de caso para três diferentes ângulos de incidência do vento (0º...

Factors influencing the retrofitting of existing office buildings using Adelaide, South Australia as a case study

Bruce, T.; Zuo, J.; Rameezdeen, R.; Pullen, S.
Fonte: Emerald Group Publishing Publicador: Emerald Group Publishing
Tipo: Artigo de Revista Científica
Publicado em //2015 EN
Relevância na Pesquisa
56.44%
Purpose – The purpose of this paper is to explore the barriers preventing investment in the re-use of low-grade multi-storey building stock in order to identify attributes that determine whether an existing building is suitable for retrofitting. Design/methodology/approach – Semi-structured interviews were undertaken with key industry practitioners to investigate existing practices and barriers facing low-grade building retrofits and what “ideal” multi-storey building features represent a successful investment opportunity. Findings – The findings showed that tenant commitment is necessary before any project goes ahead and that there exist many barriers influencing the investment decision. These include: high levels of asbestos found in existing buildings; changes in the National Construction Code necessitating enhanced fire safety and disability access; heritage listing; lack of awareness; overestimation of costs involved on simple and effective energy efficiency upgrades and change in tenant demands towards modern and efficient open plan offices. Many low-grade structures are privately owned inherited assets where the owners lack the expertise and capital to undertake retrofitting effectively. Research limitations/implications – The study is focused on the Adelaide CBD in South Australia but the findings are relevant to other Australian cities. Practical implications – There is room in the market for more positive and influential schemes such as the Green Building Fund that encourage more energy efficiency upgrading of these buildings. Social implications – The greater occurrence of retrofitting and re-use of older buildings...

Prediction of low frequency vibration and sound propagation through reinforced concrete structures

Carreira, Ana Sofia da Silva; Neves e Sousa, Albano
Fonte: Universidade do Algarve Publicador: Universidade do Algarve
Tipo: Conferência ou Objeto de Conferência
Publicado em /07/2014 ENG
Relevância na Pesquisa
36.02%
Prediction of low frequency sound fields generated in buildings by internal sources as machines or external sources such as road or rail traffic is a difficult task. Assuming that the source is well known, predictions are generally based on the Finite Element Method (FEM), which is used to model building structures and vibration and sound fields, but other hybrid or coupling methods also can be used. In general, these methods are too much time consuming and provide results which are reliable only below 100-150 Hz. Reliability at higher frequencies requires much larger models. It is, thus, important to develop simpler methods to be used with confidence by acousticians and other consultants. In the present paper a method for prediction of vibration propagation to building slabs based on the use of simplified transfer functions between fundamental joints of the structure is presented. The method was developed numerically for traditional multi-storey building with reinforced concrete slabs supported by reinforced concrete beams and columns and also was experimentally validated. The method can be used together with theoretical modal analysis to predict sound fields in dwellings.

SISTEMAS DE VEDAÇÃO EM ALVENARIA PARA EDIFÍCIOS DE ESTRUTURA METÁLICA: DETALHAMENTO COM BASE NA PREVENÇÃO DE MANIFESTAÇÕES PATOLÓGICAS; Masonry Wall Systems for Steel Buildigs: Detailing Based in Pathological Problems Prevention

Araujo, André; Paes, José Luiz Rangel; Veríssimo, Gustavo de Souza
Fonte: Universidade de São Paulo. Instituto de Arquitetura e Urbanismo Publicador: Universidade de São Paulo. Instituto de Arquitetura e Urbanismo
Tipo: info:eu-repo/semantics/article; info:eu-repo/semantics/publishedVersion; Avaliado Por Pares; ; Formato: application/pdf
Publicado em 31/12/2013 POR
Relevância na Pesquisa
36.02%
O desempenho de edifícios quanto à durabilidade está relacionado com a característica dos projetos em prever sistemas, com vistas à condição de exposição ambiental para a qual estarão submetidos. O presente artigo apresenta uma proposta para o projeto de sistemas de vedação em alvenaria para edifícios de estrutura metálica, com o intuito de proporcionar um bom desempenho quanto à durabilidade da estrutura e da vedação. Como subsídio, avaliou-se o desempenho das alvenarias de três edifícios institucionais, recentemente construídos, por meio da vistoria técnica de suas manifestações patológicas. Selecionaram-se edifícios com variações no tipo de vedação, no tipo de ligações alvenariaestrutura e no tratamento dado às fachadas. Avaliaram-se as informações produzidas em projeto e a eficácia dos detalhes. A partir dessas informações, qualificaram-se as práticas adotadas e identificaram-se, dentro de uma sequência de procedimentos, ações preventivas ao surgimento das manifestações patológicas. Por fim, são apresentdos os resultados da utilização dessas ações como norteadoras em um exercício de projeto.; The durability performance of multi storey buildings of steel structure is closely associated to the executive project planning in order to provide systems which areexposed to external conditions. The aim of this research was to present a methodological proposal for the design of masonry veneer systems for steel structure of institutional buildings which present high performance regarding durability. In order to execute this proposal...

Perceived obstacles to multi-storey timber-frame construction: an Australian study

Xia, B.; O'Neill, T.; Zuo, J.; Skitmore, M.; Chen, Q.
Fonte: Taylor & Francis Publicador: Taylor & Francis
Tipo: Artigo de Revista Científica
Publicado em //2014 EN
Relevância na Pesquisa
76.47%
The contemporary default materials for multi-storey buildings – namely concrete and steel – are all significant generators of carbon and the use of timber products provides a technically, economically and environmentally viable alternative. In particular, timber's sustainability can drive increased use and subsequent evolution of the Blue economy as a new economic model. National research to date, however, indicates a resistance to the uptake of timber technologies in Australia. To investigate this further, a preliminary study involving a convenience sample of 15 experts was conducted to identify the main barriers involved in the use of timber frames in multi-storey buildings. A closed-ended questionnaire survey involving 74 experienced construction industry participants was then undertaken to rate the relative importance of the barriers. The survey confirmed the most significant barriers to be a perceived increase in maintenance costs and fire risk, together with a limited awareness of the emerging timber technologies available. It is expected that the results will benefit government and the timber industry, contributing to environmental improvement by developing strategies to increase the use of timber technologies in multi-storey buildings by countering perceived barriers in the Australian context.; Bo Xia...